class_docstr: ImageSet wraps a set of ImageFeature
code: def to_image_frame(self, bigdl_type="float"):
      return ImageFrame(
          callZooFunc(bigdl_type, "imageSetToImageFrame", self.value),
          bigdl_type,
      )
  
imports: from bigdl.transform.vision.image import ImageFrame
  from bigdl.util.common import *
  from zoo.common.utils import callZooFunc
label_desc: Use image node_id 12 for calling the ImageSet obj's underlying member method code with example usage: obj.to_image_frame(bigdl_type) and returns: ImageFrame